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What does this data set describe?

Title:
Data of field activity D-1-96-NC in Gorda Ridge from 07/08/1996 to 08/07/1996
Abstract:
United States Geological Survey, Menlo Park, California,National Oceanic and Atmospheric Administration. Chief Scientists: Kim Klitgord, Bob Embley, Rob Zierenberg. Data (sidescansonar, airgun, gravitycore) of field activity D-1-96-NC in Gorda Ridge from 07/08/1996 to 08/07/1996, <http://walrus.wr.usgs.gov/infobank/d/d196nc/html/d-1-96-nc.meta.html>.
Supplemental_Information:

Equipment Used -
sidescansonar
airgun
gravitycore
Notes -
Leased SSS


from Western Region Marine and Coastal Surveys Bulletin, July 26,
1996...


Good eating (and results) on the Disco
Jane reid sends news from
National Oceanic and Atmospheric Administration (NOAA)'s
<http://www.noaa.gov>
research vessel Discoverer (aka Disco), where
she, Kim Klitgord (co-chief scientist), and about half a dozen other USGS'ers
are cooperating with NOAA in a three-week cruise off the pacific northwest. They
are collecting sidescan-sonar and seismic-reflection data in three areas: (1)
the coaxial segment of the Juan de Fuca Ridge, where a volcanic eruption
occurred in 1993; (2) the northern part of the Gorda Ridge, where a volcanic
eruption occurred in april of this year; and (3) Escanaba Trough (southern Gorda
Ridge), where hydrothermal vents and a thick blanket of sediment have produced
large sulfide deposits analogous to deposits on land.. here is the report Jane
sent last week:


"After some initial problems (non-sinking transponders, sticky winch, and overly
hot sidescan system) we are now getting great sidescan and sub-bottom profiles
over NOAA's floc area of the coaxial segment of the Juan de Fuca Ridge. The
transponder net is well calibrated and the winch is working to fly the towfish
at altitudes of about 160 meters above the bottom. The data looks
wonderful: fault scarps and fissures and lava structures from recent flows.
sidescan images are coming in clear and sharp. Acoustic navigation is
intermittent, but Stuart Sides and Miguel Velasco from Flagstaff have kept up
with the processing and we expect to have a completed mosaic in the next week or
so. After a couple of short deployments and recoveries on the southern part of
the Juan de Fuca, it's off to Escanaba Trough for 8 days of side-scan work
and seismic lines. The weather has been swell, though we expect it to get
sweller (a low is headed our way). The food is excellent. expect some waddling
when we return. What we all need are fewer Haagen Daz bars and more Altoids. "
for more information about vents in the northeast Pacific (and links to pages
about other neat stuff) check out this NOAA page on the world wide web:
<http://www.pmel.noaa.gov/vents/>


from Western Region Marine and Coastal Surveys Bulletin, August 2,
1996...


More news from the Discoverer
The Escanaba part of the survey is collecting great data right now. We have two
excellent NW and two NE trending profiles across the mounds region and are about
to start the third. Great records on the sidescan, 4.5khz, and airgun systems.
the quality is definitely above expectations. Poor fish nav but good ship nav.
25-30 knot winds have delayed us a bit due to difficulty holding courses going
with the wind, so we have had to make some adjustments to acquire the desired
data. Still the prospects for 100% data of the trough, but unless there are
major problems we will have not trouble acquiring all of the primary data in the
mounds vicinity. Seismic data indicate that we may be able to develop a relative
fault age distribution. Rob Zierenberg is thrilled with sidescan images over the
mounds with 1000m swaths at 100m above seafloor. Sulfide mound zones are clearly
visible. NW trending faults coming into the mounds are "very" linear. could not
ask for better images. Very easy to correlate faults and other structures in
the airgun data with features on the deep towed sidescan and 4.5khz data.
sidescan processing is nearly complete for the NOAA Juan de Fuca co-axial region
study and Stuart and Miguel are already working on the Escanaba data. Larry,
Mike, and Tom have a superb seismic reflection profile record coming in. Initial
processing of seismic reflection data is already underway on Tommy's Silicon
Graphics machine, for both airgun and 4.5khz data sets. Swath bathymetric
processing for escanaba is about to start but should be easy by comparison with
the Juan de Fuca data set. Operations are smooth and the whole team is putting
in a great effort. The Williamson team is providing great support.:Kim


Discoverer's good voyage
The Disco is coming into port today, ending the last oceanographic cruise of her
30-year career. If all goes as predicted, she "will be escorted in by a fire
boat, spraying water as we approach the locks into lake union. We're stopping in
Everett to pick up 80 or 100 crew dependents so they can transit the rest of the
way in. We should arrive at the dock on Lake Union about 1:30 p.m. on Friday.
whee!" Jane Reid


Here's a recap on the cruise from Kim Klitgord.
The NOAA-USGS cruise on the NOAA's Discoverer, with Robert Embley (NOAA) and Kim
Klitgord (USGS) as co-chief scientists, has successfully completed its sidescan
sonar studies of the co-axial segment of the Juan de Fuca Ridge (NOAA vents
program) and the Escanaba Trough on the southern Gorda Ridge. The AMS-60
sidescan sonar system and 4.5 khz sub-bottom profiler system leased and operated
by Williamson and associates were used for both surveys. At Escanaba Trough,
nearly 350 km of near-bottom sidescan sonar and 4.5 khz sub-bottom penetration
data and surface towed airgun seismic reflection data were acquired on a grid of
18 lines over the Nesca hydrothermal system within the axial valley of Escanaba
Trough. A tight grid of 1 to 2 km spacing swaths in both the NNW and NE
directions have provided two complete sidescan mosaics with different image
angles for interpreting the surficial geologic character of the 18 km x 25 km
region centered on the hydrothermal mounds that are the drill target for the
ODP leg 169 that starts later this month with Rob Zierenberg (USGS) as co-
chief scientist. Stuart Sides and Miguel Velasco (Flagstaff) have already
completed the sidescan sonar processing and Rob is hopping from the Discoverer
to the Joides Resolution with a set of fantastic mosaics. The 4.5 khz seismic
system routinely imaged over 50 meters below the seafloor and provided a superb
stratigraphic record of the interlinked volcanism, deformation and turbidite
deposition within Escanaba Trough. "z" and Stephahie Ross have been constantly
identifying features on these records that they have found on previous dives,
camera runs, and sampling sorties. Stephanie, Kaye Kinoshita and Jane Reid
(USGS), Bill Chadwick and Julia Getsiv (NOAA), and Jim Fowler (Arizona State)
have kept us tightly navigated, ruled the watches and made sure that all we
found would not be lost. The 160 cu.in. single channel airgun data provided an
excellent image of the entire sediment column and basement structures for the
entire area, at times exceeding 1000 m of penetration. Larry Kooker, Mike Boyle,
Tom O'Brien and Hal Williams were jumping, keeping the airgun and winch systems
fine tuned. Se Won Chang and Hun Soo Choi have become the moguls of
swath-bathymetry mapping, keeping Tommy O's Silicon Graphics workstation
filled with bits and bytes, occasionally bringing it to its knees. The Escanaba
Trough survey revealed a narrow 4-km wide zone of neotectonic activity with the
most active faulting and volcanic activity. The recent basaltic flows provided
bright sidescan targets enabling us to readily map their areal extent and to
identify their likely eruption source: a fissured volcanic hill 2 km east of the
hydrothermal central hill of Nesca. The hydrothermal fields on the central hill
and southwest hill were clearly identifiable. Growth faults in the 4.5 khz data
provide a fine data base for establishing the faulting history within the
neotectonic zone to complement the volcanic history.
Publications -
Ross, Stephanie L., and Zierenberg, Robert A., 2009, Sidescan Sonar Imagery of
the Escanaba Trough, Southern Gorda Ridge, Offshore Northern California:
Scientific Investigations Map 2907, scale 1:25,000. URL:
<A HREF ="<http://pubs.usgs.gov/sim/2907/>" target ="MF"><http://pubs.usgs.gov/sim/2907/>

Similar information is available for thousands of other USGS/CMG-related Activities.
If known, available are Activity-specific navigation, gravity, magnetics, bathymetry, seismic, and sampling data; track maps; and equipment information; as well as summary overviews, crew lists, and information about analog materials.
If available, access to physical samples is described in the "WR CMG Sample Distribution Policy" at:
<http://walrus.wr.usgs.gov/infobank/programs/html/main/sample-dist-policy.html>
Primary access to the USGS/CMG Information Bank's digital data, analog data, and metadata is provided through... <http://walrus.wr.usgs.gov/infobank/>
This page accomodates a variety of search approaches (e.g., by platform, by region, by scientist, by equipment type, etc.).
  1. How should this data set be cited?

    U.S. Geological Survey (USGS) <http://www.usgs.gov/>, Coastal and Marine Geology Program (CMGP) <http://marine.usgs.gov/>, 20131029, Data of field activity D-1-96-NC in Gorda Ridge from 07/08/1996 to 08/07/1996: U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>, Menlo Park, CA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -127.85317
    East_Bounding_Coordinate: -127.36833
    North_Bounding_Coordinate: 41.17267
    South_Bounding_Coordinate: 40.39450

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 08-Jul-1996
    Ending_Date: 07-Aug-1996
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      Indirect_Spatial_Reference: Gorda Ridge
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point

    2. What coordinate system is used to represent geographic features?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.00001. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257.

      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Local surface
      Depth_Resolution: 0.1
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Attribute values


  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    Navigation with Time Stamp <http://walrus.wr.usgs.gov/infobank/programs/html/definition/nav.html>


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    Kim Klitgord (Chief Scientist, USGS Western Region); Bob Embley (Chief Scientist, NOAA); Bill Chadwick (Navigation and Geologist, NOAA); Julia Getsiv (Navigation, NOAA); Rob Zierenberg (Chief Scientist, USGS Western Region); Stephanie Ross (Side Scan Sonar Data, USGS Western Region); Jane Reid (Seismic Reflection Data, USGS Western Region); Kaye Kinoshita (Ctd Studies And Navigation, USGS Western Region); Stuart Sides (Sidescan Sonar Processing, USGS Western Region); Miguel Velasco (Sidescan Sonar Processing, USGS Western Region); Larry Kooker (Electrical Technician, USGS Western Region); Mike Boyle (Electrical Technician, USGS Western Region)

  3. To whom should users address questions about the data?

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>


Why was the data set created?

These data and information are intended for science researchers, students from elementary through college, policy makers, and general public.


How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

    Date: 10-Aug-2000 (process 1 of 1)
    Navigation Data Unknown

    Person who carried out this activity:

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>

  3. What similar or related data should the user be aware of?

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>, Unknown, USGS/CMG Information Bank <http://walrus.wr.usgs.gov/infobank/>: U.S. Geological Survey (USGS) <http://www.usgs.gov> Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>, Menlo Park, CA.

    Online Links:

    Other_Citation_Details:
    Ross, Stephanie L., and Zierenberg, Robert A., 2009, Sidescan Sonar Imagery of the Escanaba Trough, Southern Gorda Ridge, Offshore Northern California: Scientific Investigations Map 2907, scale 1:25,000. URL: <A HREF ="<http://pubs.usgs.gov/sim/2907/>" target ="MF"><http://pubs.usgs.gov/sim/2907/>



How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    Identified as best available version.

  2. How accurate are the geographic locations?

    Unspecified

  3. How accurate are the heights or depths?

    Unspecified

  4. Where are the gaps in the data? What is missing?

    Start and end date/times of data

    Navigation Data (d-1-96-nc.060 [GPS])
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    199607291529000    199608061440000
    YYYYMMDDHHMMSST    YYYYMMDDHHMMSST
    

  5. How consistent are the relationships among the observations, including topology?

    Unspecified


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
Physical materials are under controlled on-site access.
If available, access to physical samples is described in the "WR CMG Sample Distribution Policy" at: <http://walrus.wr.usgs.gov/infobank/programs/html/main/sample-dist-policy.html>
Use_Constraints:
Please recognize the U.S. Geological Survey (USGS) as the source of this information.
Physical materials are under controlled on-site access.
Some USGS information accessed through this means may be preliminary in nature and presented without the approval of the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the responsibility of the user.
This information is not intended for navigational purposes.
Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

  1. Who distributes the data set? (Distributor 1 of 1)

    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>

  2. What's the catalog number I need to order this data set?

    Downloadable Data D-1-96-NC data set <http://walrus.wr.usgs.gov/infobank/d/d196nc/html/d-1-96-nc.meta.html>

  3. What legal disclaimers am I supposed to read?

    Please recognize the U.S. Geological Survey (USGS) as the source of this information.
    Physical materials are under controlled on-site access.
    Some USGS information accessed through this means may be preliminary in nature and presented without the approval of the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the responsibility of the user.
    This information is not intended for navigational purposes.
    Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

  4. How can I download or order the data?

    • Availability in digital form:

Data format: ASCII Size: 0.1
Network links: <http://walrus.wr.usgs.gov/infobank/d/d196nc/html/d-1-96-nc.nav.html>

  • Cost to order the data: None


  • Who wrote the metadata?

    Dates:
    Last modified: 29-Oct-2013
    Metadata author:
    U.S. Geological Survey (USGS) <http://www.usgs.gov>, Coastal and Marine Geology (CMG) <http://walrus.wr.usgs.gov>
    Attn: Clint Steele <http://walrus.wr.usgs.gov/staff/csteele.html>
    InfoBank Group Leader <http://walrus.wr.usgs.gov/staff/csteele.html>
    USGS, MailStop 999, 345 Middlefield Road
    Menlo Park, CA 94025-3561
    USA

    (650) 329-5055 (voice)
    (650) 329-5190 (FAX)
    infobank@octopus.wr.usgs.gov <mailto:infobank@octopus.wr.usgs.gov>

    Metadata standard:
    FGDC Content Standards for Digital Geospatial Metadata <http://www.fgdc.gov/> (FGDC-STD-001-1998 <http://www.its.nbs.gov/nbs/meta/meta.html>)


    Generated by mp version 2.9.13 on Tue Oct 29 08:21:36 2013